When an electron in an atom falls from a higher energy level to a lower one, a ______________ is ______________
a. proton; absorbed
b. proton; emitted
c. photon; absorbed
d. photon; emitted
d
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A string on a violin is stretched between two points 20.0 cm apart with a tension of 120 N. The mass/length of the string is 0.00200 kg/m. The frequency of the mode of vibration with the lowest frequency is
A. 502 Hz. B. 550 Hz. C. 598 Hz. D. 612 Hz. E. 750 Hz.
In the context of life in the universe, which of the following discoveries of astronomy suggests that enormous numbers of habitable worlds may exist in the universe?
A) the laws of physics are the same everywhere B) the universe is very old C) the universe is very large D) the building blocks of life are common
When an acrobat hangs motionless from a pair of rings
A. she has no measurable weight. B. her weight depends on the angles the ropes make with the ceiling. C. her weight is reduced by the upward force the rings exert on her. D. her weight is increased by the upward force the rings exert on her. E. she exerts a gravitational force on the Earth that is equal to the sum of the forces the rings exert on her.
A 0.16 pF parallel-plate capacitor is charged to 10 V. Then the battery is disconnected from the capacitor. When 1.00 × 10^7 electrons are now placed on the negative plate of the capacitor, the voltage between the plates changes by
a. ?5.0 V. b. ?1.1 V. c. 0 V. d. +1.1 V. e. +5.0 V.